While cheating -- and those who cheat on their romantic partners -- is often sensationalized in the media, author Ann Smith, writing for Psychology Today, highlights that cheating has a devastating impact on affected spouses. Dating a married man is also unfair to you because you run the risk of becoming emotionally vulnerable with a man who is unable to commit to you. Knowing the signs of whether or not you're dating a married man can help protect your heart and sanity.

A married man does not want you showing up at his home, says Mark Perry, writing for HealthGuidance.org. Take notice if the man you're dating never invites you over and makes excuses if you invite yourself. Become suspicious if he seems reluctant to disclose his address.

A married man risks getting caught when he takes you out in public. Men who repeatedly choose remote locations or avoid high profile destinations, give rise to suspicion. Some married men may not want to go out at all, suggesting staying in and cuddling instead.

Men who always arrive late may have something to hide. A married man cannot tell his wife where he goes when he comes to see you, so he will often run late because he had trouble getting away from his wife. If the man you are dating constantly shows up late and makes excuses about why, he could be married.

Meeting a boyfriend's family marks the progression to seriousness in many relationships. If you date a man for a considerable length of time and do not get an invitation to meet his family, consider asking him why.

A married man cannot give you his home phone number because his wife or children may answer the phone. He will not risk you leaving a message on the house answering machine. A red flag goes up when a man gives you his cell phone number only.

The weekend provides time for couples and families to relax and do things together. If the man you date becomes scarce on the weekends, he may be spending time with his wife and children. The same holds true for major Holidays.

If your boyfriend becomes much more distant in public than when the two of you are alone, he could be afraid of recognition. A cheating man never knows when he will run into an in-law or his wife. Keeping his distance from you in public makes it less likely that people will see you as a couple.

If your boyfriend finds excuses not to stay the night with you, be cautious. A married man would alert his wife to his suspicious behavior if he spent repeated nights away from home.